picometre
Sign in to saveThe picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to , or one trillionth of a metre, which is the SI base unit of length.
AI overview
A picometre is an extremely tiny unit of measurement equal to one trillionth of a metre, used in the International System of Units. It's useful for measuring very small things like atoms and molecules, where such minuscule distances become relevant to scientific work.
AI-generated from the Wikipedia summary — may contain errors.
Key facts
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- A simplified representation of a helium atom, having an estimated (calculated) diameter of 62 picometres
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- length
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The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to , or one trillionth of a metre, which is the SI base unit of length.
The picometre is one thousand femtometres, one thousandth of a nanometre ( nm), one millionth of a micrometre (also known as a micron), one billionth of a millimetre, and one trillionth of a metre. The symbol μμ was once used for it. It is also one hundredth of an ångström, an internationally known (but non-SI) unit of length.